To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Water Crystal's first ability)
Standard has a maximum of the most recent sets legal at once while Pioneer has over 10 years worth of sets from Return to Ravnica forward
After some tinkering and goldfishing, I realized how busted some draws were: Citadel, Bauble, Opal into Mine on turn one let me cast an improvise threat every turn as of turn two while drawing multiple cards and excluding my opponent
This card gives you two flying insects, +1/+1 to all of them, and deathtouch if you have delirium
Of course, that said, its not like Despise is legal or anything
Decision is a fun card to bargain with in certain matchups, but it always serves you well against other control lists as long as you target the right spells and dont let yourself get your own spells countered by your opponents votes